# Phase 10: Classification Layer - Discussion Log

> **Audit trail only.** Do not use as input to planning, research, or execution agents.
> Decisions are captured in CONTEXT.md — this log preserves the alternatives considered.

**Date:** 2026-03-27
**Phase:** 10-classification-layer
**Areas discussed:** PROTO-08 frequency gap, Plain vs TLS port handling

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## PROTO-08 Frequency Gap

| Option | Description | Selected |
|--------|-------------|----------|
| Auto-assign range (Recommended) | Let autoAssignFreq handle them (FNV hash in [2500, 4000] Hz). Built-in constants + rules, but frequencies behave like user-defined classes. Simplest, no table redesign. | ✓ |
| Extend the table | Add 3 more slots above SIP at 2449 Hz. Proper built-in ClassFreqConfigs entries. Pushes into auto-assign territory, requires range shift. | |
| Squeeze into Infrastructure band | Insert 3 slots between existing Infrastructure entries (65-133 Hz). Most musically coherent but touches Phase 9's locked design. | |

**User's choice:** Auto-assign range (Recommended)
**Notes:** LDAP, Kerberos, Syslog get TrafficClass constants and rules but their Hz values come from autoAssignFreq rather than designed table slots. No Phase 9 table redesign needed.

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## Plain vs TLS Port Handling

| Option | Description | Selected |
|--------|-------------|----------|
| Same class (Recommended) | IMAP 143 and IMAPS 993 both classify as ClassIMAP. Simpler, fewer classes. Exception: keep SMTP/SMTP-sub separate per Phase 9 design. | ✓ |
| Separate classes | IMAP and IMAPS are distinct TrafficClasses with distinct sounds. More granular but doubles class count and needs more frequency slots. | |
| Same class, no SMTP exception | Merge everything including SMTP + SMTP-sub into single ClassSMTP. Wastes Phase 9 SMTP-sub slot at 305 Hz. | |

**User's choice:** Same class (Recommended)
**Notes:** Plain/TLS variants share one class. SMTP (25) and SMTP-submission (587) remain separate because Phase 9 designed distinct frequency slots for them.

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## Claude's Discretion

- Rule ordering within specific-port section
- Test structure for new protocols
- How to update TestAllClassesCount
- Whether to group rules by family with comments

## Deferred Ideas

None — discussion stayed within phase scope.